(19)

(11)

EP 4 179 693 A1

(12)

(43) Date of publication: 17.05.2023 Bulletin 2023/20 (21) Application number: 21737001.4 (22) Date of filing: 23.06.2021

(51) International Patent Classification (IPC):  H04L 9/08(2006.01) H04L 9/14(2006.01) (52) Cooperative Patent Classification (CPC): H04L 9/0822; H04L 9/083; H04L 9/14 (86) International application number: PCT/EP2021/067134 (87) International publication number: WO 2022/008247 (13.01.2022 Gazette 2022/02)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 10.07.2020 US 202016925403 (71) Applicant: International Business Machines Corporation Armonk, New York 10504 (US)	(72) Inventor: SOFIA, Anthony Thomas Poughkeepsie, NY 12601-5400 (US) (74) Representative: IBM United Kingdom Limited  Intellectual Property Law Hursley Park Winchester, Hampshire SO21 2JN Winchester, Hampshire SO21 2JN (GB)